38 
THE YOYAGE OF H.M.S. CHALLENGEK. 
ending in spines. The telson has a broad convex median dorsal ridge which ends behind 
in a short acute spine, and on each lateral portion there are four or five sharply defined 
parallel longitudinal carinse. The posterior border of the telson has three pairs of acute 
straight spines, and there is a single rounded tooth between the lateral and postero- 
lateral. eight acute curved teeth between the latter and the submedian, and four between 
this and the middle line, which is deeply notched. The sixth abdominal appendage is 
very large, and the terminal paddle of the exopodite is oval and half as long as the 
proximal joint. The endopodite is long, narrow, and very slightly curved, and the 
prolongation from the ventral surface of the basal joint ends in a short curved acute 
outer spine, and a much longer acute inner spine which has a rounded tooth on its outer 
border, and on its inner border seven or eight acute teeth which increase in size distally. 
There is an acute spine on the dorsal surface of the basal joint. 
The rostrum reaches to the base of the ocular segment, and the eyes are directed 
forward, side by side, and nearly cylindrical and about twice as long as wide. The first 
antennae are long (y^ of the total length of the body), and their somite ends dorsally in 
a pair of acute spines which are slightly divergent. The flagellum of the second antenna, 
including the shaft, is about three-fourths (f§) as long as the first, and the scale is as 
long as the animal. The width of the carapace between the antero-lateral angles is half 
(b$) its greatest width and a little less than half (^Y) its length. The dactyle of the 
raptorial claw is armed with six acute curved teeth gradually increasing in size distally. 
The second joint has three movable spines on its inner edge, and the pectinations on its 
inner edge are arranged in an undulating line, with a convexity under each tooth. The 
appendages of the three pairs of exposed thoracic limbs are flat, strap-shaped and more 
dilated and rounded at the tip than they are in Squilla lata. The lateral edges of 
the second thoracic somite are acute, and strongly curved forward, while the lateral 
edges of the third and fourth are rounded. The fifth has a subacute prominence on 
each side. Males and females alike, except as regards the structures concerned in 
reproduction. 
Habitat. — Station 233b, Inland Sea, Japan, May 26, 1875; lat. 34° 18' N., long. 
133° 35' E. ; depth 15 fathoms; bottom blue mud. 
Two specimens, a male and a female, were obtained. The only other specimen known 
is also from Japan, and is described by De Haan as the type of the species. 
Remarks . — This species is very similar to the one last described, agreeing with it in 
the presence of six teeth in the raptorial claw, the cylindrical shape of the eyes, the 
almost total absence of median and submedian dorsal carinse, the great width and the 
uniform increase in width of the hind body, the flattened strap-like shape of the appendages 
of the exposed thoracic legs, the great length of the curved endopodite of the sixth 
abdominal appendage, and the presence of acute teeth on the inner margin of its inner 
spine. There arc so many well-marked points of difference, however, that there can be 
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